title: Investigation of formaldehyde oxidation over Co3O4-Ce2 and Au/Co3O4-CeO2 catalysts at room temperature: effective removal and determination of reaction mechanism.
abstract: Formaldehyde is regarded as the major indoor pollutant emitted from widely used building and decorative materials in airtight buildings, which should be eliminated under indoor environmental conditions. We report here catalytic oxidation process of formaldehyde over mesoporous Co(3)O(4), Co(3)O(4)-CeO(2), Au/Co(3)O(4), and Au/Co(3)O(4)-CeO(2) catalysts and their excellent catalytic performances at room temperature. These catalysts were prepared by a "nanocasting" method with the mesostructure generated from SBA-15 silica with 2D structure. The adsorbed surface species in the formaldehyde oxidation process are analyzed, and some key steps in the oxidation pathway, active sites, and intermediate species are proposed. Among the detected species, some kinds of formate species formed on the catalysts were indentified as intermediates, which further transformed into bicarbonate or carbonate and which decomposed to carbon dioxide. The role of the mesoporous Co(3)O(4) and the gold nanoparticles in the mechanism are also revealed.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, PR China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Ma
authors.forename: Donghui
authors.initials: D
authors.lastname: Wang
authors.forename: Wenjuan
authors.initials: W
authors.lastname: Xue
authors.forename: Baojuan
authors.initials: B
authors.lastname: Dou
authors.forename: Hailin
authors.initials: H
authors.lastname: Wang
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Hao
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D016902:Air Pollution, Indoor / Q000517:prevention & control*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D005557:Formaldehyde / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D013696:Temperature
chemical_list: D000393:Air Pollutants; D010087:Oxides; D005557:Formaldehyde; D002563:Cerium; D003035:Cobalt; D006046:Gold; C060728:cobalt oxide